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— — Flashing UPS battery is low; beep every half-second Flashing — Flashing The unit is overloaded; beep every half-second ON — Flashing The UPS has failed; continuous beep MAINTENANCE The PowerSure PST UPS requires very little maintenance. Follow these practices to prevent problems. CLEANING THE UPS The following will help ensure trouble-free operation for years: • Vacuum dust from the ventilation intake occasionally. • Wipe the cover periodically with a dry cloth. MAINTAINING BATTERIES The batteries are valve-regulated, nonspillable, lead acid and must be kept charged to retain their design life. The UPS continuously charges the batteries when connected to the utility supply, even while the UPS is switched off. When storing the UPS, it is recommended to plug in the UPS for at least 24 hours every four to six months to ensure full recharge of the batteries. If the UPS fails to operate properly, turn off the unit and repeat the steps in the Installation section of this manual. If the problem persists, refer to the chart below: Problem Cause Solution UPS will not start Overload/ Short circuit Check the circuit protector on the side of the UPS. If it is tripped, reset it and restart the UPS. For further help, call your local dealer, Liebert representative or the Liebert Worldwide Support Group. UPS not Plug in power cord plugged in securely. Circuit Reset the circuit protector protector and restart thetripped UPS. UPS starts on battery, Power not available at utility receptacle Have the utility receptacle checked by aqualified electrician. but will not switch to AC Input voltageWait until the voltage rises to an appropriate below level or have the utility threshold receptacle checked by aqualified electrician. Wait until voltage lowers AC overvoltage to an appropriate levelor have the utility receptacle checked by aqualified electrician. Overload/Check the circuit Short circuit protector on the rear ofthe UPS. If it is tripped, reset it and restart the UPS. If the problem persists, UPS shuts down, Fault Indicator lit Internal UPS fault disconnect some of the equipment from your UPS—the total wattage of your equipment must not exceed the capacity of the UPS. For further help, call your local dealer, Liebert representative or the Liebert Worldwide Support Group. Site Wiring Fault Indicator illuminated Line-neutral reversal/Poorground connection Have the utility checked by a qualified electrician. UPS not Overload Reduce load. providing Battery notexpectedbackup time charged due to a recent Recharge battery. outage WARRANTY REGISTRATION To register for warranty protection: • Visit the Quick Links section of our Web site at: • Click on Product Warranty Registration and fill in the form. IF YOU HAVE ANY QUESTIONS, PLEASE CONTACT US AT: US: 800-222-5877 Outside the US: 614-841-6755 upstech@liebert.com SL-23275QS (9/03) Rev. 0 ...

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